Double Veronese cones with terminal Gorenstein singularities admit sharp bounds on nodes, with a Q-factorial example having 21 nodes, plus criteria for rationality and unirationality.
Lie groups and L ie algebras
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Double Veronese cones with singularities
Double Veronese cones with terminal Gorenstein singularities admit sharp bounds on nodes, with a Q-factorial example having 21 nodes, plus criteria for rationality and unirationality.